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M. H. ROBERTS.

, Hot Air Furnace.

No.,238,003. Patented Feb". 22,1881.

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N. PETERS. PNOTGLITHOGHAPH Enr WASHINGTON. D, c.

UNITED STATES PATENT OFFICE.

MATTHEW H." ROBERTS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO FRANK S. FITZWATER AND FRANK A. SHOEMAKER,l OF SAME PLACE.

HOT-AIR FU RNACE.

SPECIFICATION forming part of Letters `Patent No. 238,003, dated February 22, 1881.

Application filed November 10, 1880.

To all 'whom 'it may concer/n:

Be it known that I, MATTHEW H. RoEERTs, of Philadelphia, Pennsylvania, have invented a new and useful Hot-Air Furnace, of which the following is a specification.

My invention relates to theimprovement of various parts of the heater, the adaptation ot' the heater to the drying of fruit, and the general construction of the heater as an entirety,

1o whereby it is simplified and cheapened in construction, and is more durable.

Figure l is a section through the dryingchamber above the heater. Fig. 2 is a vertical section. Fig. 3 is an elevation. Fig. 4 is I5 a section on line s c. Fig. 5 is a section on line m y. Fig. 6 is a section through the top of the iire-chamber.

I take the cast-iron frame A, carrying the furnace-door a', the cleaning-door a2, and the 2o ash-pit door c3, and attach it by screws to a wrought-iron front, B. To the bottom of this front I fasten a curved wrought angle-iron, c', and about the mid-height of the heater I place a similar piece of wrought T-iron, c2, or two 2 5 angle-irons riveted back to back, and near the top I place another wrought T-iron, c3. These three form the frame which steadies in its position the outside case, D, of the heater. They may also be of cast-iron, but are more liable 3o to break. l

rIhe case 1s made in three parts, d cl2 d3, which are easily slipped over these curved iron rings and held securely in place by them. The two lower rings are cut away in front and their ends fitted to the heater-front.

The ash-pit E is made in a horseshoe form. I take a piece ot' wrought angle-iron, e', and bend it into a horseshoe form and secure it to the furnace-front. The side e2 ot' the ash-pit 4o I make of sheet-iron bent into a similar form and iitted to the angle-iron. I place upon this a cast-iron plate, F, and hold all three in tight contact by the bolts g. It will be seen that by this construction the wrought angle-irons Y 4 5 c and e rest on the floor, and the usual castiron bed-plate is dispensed with.

To the cast-iron plate, which carries the wrought-iron lire-chamber H and the grate 7L', are bolted the lugs f2, upon which stands the (No model.)

middle cylinder, K. The cylinder H is of 5o plain sheet-iron lined with tire-brick h2 just above the grate. The feeder-door a leads by a short neck into the cylinder, and the top h3 is made as a removable cap having a central outlet, h4, beneath which is suspended the deflecting-plate h5.

To the smoke-and-tlame outlet h4 is attached the horizontal drum L, one end of which leads to the chimney through a coil, m3, extending around the interior of the air-chamber M. The drum L has within it, placed horizontally, a plate of soapstone, m', rather shorter than the drum. This is to receive the force of the current of flame and gas, which is deected both ways, part passing around and over the top of the plate to the chimney, and part passing direct to the chimney. The end plate, m2, of this drum L is removable, so that the soapstone deiector can be easily changed. The cap h3 being also removable, the parts h2 and h5, which are most subject to be worn out, are easily exchanged.

In order to carry the drum L and the coil of pipe m3, the cap h3 is strengthened by the an gle-irons hf".

As the front of my heater is hat and the ,case above it circular, an overhanging lip is formed at d5.

' The outside section of the case d stands upon the floor, and the air is admitted through holes n, which may be simply openings, Iormay have projecting collars, to which can be fastened pipes connecting with any source of pure air. The air entering at these holes passes upward on each side of the casing K into the chamber M. Here it commingles with another current of fresh air, which enters the chamber M at p, and impinges against the smoke-tube m3. The heated air then passes upward in the extension of the chamber Mfor drying fruit, or it can be directed through various conductors to the rooms of a dwelling.

I claiml. In a hot-air furnace, the wrought-iron rechamber H,in combination with the fire-brick 95 pot h2, the removable top h3, having a central opening, h4, the ash-pit E, and hot-air casing D.

2. In a hot-air furnace, the Wrought-iron rechamber H, in combination with a removable top, h3, and tbe angleiron braces h6.

3. In a hot-air furnace, lche Wrought-iron re- 5 chamber H, in combination with the removable top h3 and the arne-deflector h5.

4. 1n a hot-air furnace, the combination of a fire-chamber, a removable top, h3, and the drum L, having a defiecting soapstone plate 1o Within it, as described.

5. In a hot-air furnace, the combination of a lire-chamber and a drum, L, with soapstone deilecting-plate and removable cap m2.

6. In a hot-air furnace, the combination of the fire-chamber H, the casing D, and the inlet 15 air-holes n with the inlet air-holes p in the air-chamber M, as described.

MATTHEW H. ROBERTS.

Vitnesses:

PARK MFARLAND, J r., JOHN F. GRANT. 

